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16-20 ounces should be plenty. You just need enough to compensate for however much out of balance the tires are. Too much isn't going to hurt anything, just adds extra unsprung weight.

Those 38" should fit no problem, stock is 37" You might not be able to run full size tire chains with them though, if that is a concern. If your suspension is good (and it's not uncommon for the springs to sag on these, so check them), you can do up to 40" tire without a lift. The reason...

antifreeze. It's designed to be rubber safe as well as non corroding to metals. I don't think it has to be mixed, it can be straight antifreeze since you aren't looking for heat transfer ability in this application. The only real downside to using antifreeze is it soaks into the rubber...

To me the center looks like it's just a placeholder for a manual locker as used by a lot of 4wd vehicles.